Final Accounts: How to Close Out the Money Without Leaving Any Behind

The final account is the last commercial act on a construction project. It's the agreed statement of the total sum due to the contractor, taking into account the original contract sum, all variations, all claims, all adjustments. Once it's agreed and paid, the project is commercially closed.

In theory, the final account should be a straightforward reconciliation. In practice, on most projects I've worked on, it's a negotiation — sometimes a long and painful one. The contractor says the final account is £2.4m. The client's QS says it's £2.1m. The difference — £300,000 — is a fight about variations, measured quantities, provisional sums, and daywork that will take weeks or months to resolve.

Every pound of that difference is money you've already spent. If you lose the argument, it comes directly off your margin.

When to Start

Most contractors leave the final account too late. The project finishes, the team moves on to the next job, and six months later someone remembers they need to submit the final account. By then, the QS who ran the job has left for another firm, the supporting documents are in a box somewhere, and the detailed knowledge of what happened and why has faded.

Start preparing the final account from the moment practical completion is certified. Better yet, build towards it throughout the project. If you've been managing your commercial position properly — submitting variations as they occur, tracking measured quantities, reconciling subcontractor accounts as sections complete — the final account is just pulling together information you've already compiled.

Under most JCT contracts, the contractor has a contractual obligation to submit final account documentation within a specified period after practical completion — typically three to six months. Missing this deadline doesn't extinguish your rights, but it weakens your negotiating position and delays payment.

The Components

A final account typically consists of:

The adjusted contract sum. Start with the original contract sum and adjust for all contractual changes: architect's instructions, confirmed variations, PC sum adjustments, provisional sum expenditure, measured work adjustments. Each adjustment should reference the instruction or document that authorised it.

Variations. Every variation instruction, with the agreed or proposed valuation. Ideally, most variations have been agreed during the project. If not, present your valuation with full supporting calculations and records. Unresolved variations are the single biggest source of final account disputes.

Provisional sum adjustments. The contract will include provisional sums for works that couldn't be fully defined at tender. The final account replaces each provisional sum with the actual cost of the work carried out. If the actual cost exceeds the provisional sum, you're entitled to the difference. If it's less, the client gets a credit.

PC sum adjustments. Prime cost sums for materials or goods specified by the designer. The actual cost replaces the PC sum, and you're entitled to add your profit and attendance percentages as stated in the contract.

Measured work adjustments. If the contract is based on bills of quantities, remeasurement of the actual work done compared to the billed quantities. Overruns and underruns against each item.

Daywork. Work carried out on a daywork basis, properly documented with daywork sheets signed by the architect or clerk of works.

Loss and expense. Claims for loss and expense arising from matters listed in the contract — typically delay, disruption, and variations that couldn't be reasonably anticipated.

Contra charges. Any deductions the employer is entitled to make — liquidated damages (if applicable), defects remedied by others, insurance claims.

Presenting It Properly

The quality of your final account submission directly affects how quickly it gets agreed. A well-presented final account with clear supporting documentation gets settled in weeks. A poorly presented one — round numbers, no references, missing backup — sits on the client's QS's desk for months.

Structure it logically. Follow the order of the contract: original sum, variations, provisional sums, PC sums, measured adjustments, daywork, loss and expense. Number each item. Reference each item to a specific instruction, drawing, or contract clause.

Include all supporting documentation. For each variation: the architect's instruction, your quotation or valuation, any correspondence about scope or value, records of work carried out. For daywork: signed daywork sheets, labour allocation sheets, material invoices. For loss and expense: the notification, the records, the calculation.

Show your working. Don't just state a figure — show how you arrived at it. If a variation is valued at £14,500, show the labour calculation, the material costs, the plant, the overheads, and the profit. Transparency builds credibility and makes it harder for the client's QS to dismiss your figures.

Separate agreed from disputed. If some items are already agreed, say so. Highlight the items that remain in dispute. This focuses the negotiation on the areas that actually need resolving, rather than re-opening everything.

Negotiating

Final account negotiation is a commercial exercise, not a legal one. Unless you're heading to adjudication, it's a conversation between professionals about the fair value of the work.

Pick your battles. If you have 50 variation items in dispute, identify the 10 that account for 80% of the value and focus your preparation on those. Concede the small ones if it moves the process forward. Spending three meetings arguing about a £400 variation while a £40,000 item sits unresolved is poor commercial management.

Be prepared to trade. Final account negotiation often involves compromise. You might accept a lower figure on one variation in exchange for the client's QS agreeing a higher figure on another. That's normal and healthy, provided the overall outcome is fair.

Don't bluff. If your variation valuation is £14,500 and you know the real cost was £11,000, padding it to £18,000 as a negotiating tactic is transparent and damages your credibility. Price honestly, present thoroughly, and defend your figures with evidence.

Set a meeting. The fastest way to resolve a final account is sitting down with the client's QS, going through each item, and either agreeing it or identifying what additional information is needed to resolve it. Doing this by email — sending a figure, waiting three weeks for a response, sending a counter, waiting another three weeks — takes forever.

Know your walk-away point. Before the negotiation, know the minimum figure you'll accept. If the gap between your position and the client's position is too large to bridge through negotiation, you have the right to refer the matter to adjudication. Sometimes stating this clearly — "we've been unable to agree and we're considering our options under the contract" — is enough to prompt a more realistic conversation.

Subcontractor Final Accounts

While you're negotiating your final account with the client, your subcontractors are doing the same with you. Managing subcontractor final accounts in parallel with the main contract final account is one of the most time-consuming aspects of commercial close-out.

Agree subcontractor final accounts as early as possible — ideally before you finalise the main contract final account. You need to know your actual subcontract costs to understand your final margin position. An agreed main contract final account is worth much less if you subsequently discover that three subcontractor accounts are coming in higher than you anticipated.

The Clock is Ticking

Every month the final account remains unresolved is a month of uncertainty on your balance sheet. It's a month of management time spent on a project that should be closed. And it's a month of the client holding your money.

In Construction AI, the financial module tracks the entire commercial lifecycle — from payment applications and variation registers through to final account preparation. Having all the commercial data in one place, linked to the original contract, means the final account builds itself as the project progresses rather than requiring a retrospective assembly exercise at the end.

Get the final account submitted early. Present it properly. Negotiate firmly but fairly. And close the job out so you can focus on the next one.